For some uses it's useful to have the list of page titles in their natural unsorted order.
It's trivial for anybody to sort these lists if they are distributed unsorted.
It's impossible for anybody to restore these lists to their original order however.
The sort that's done is likely by byte or by codepoint which will be useful for English but for most other languages will be wrong. Sorting an already sorted list into a similar but different order is close to worst case for quicksort which most text file sorters use.
Retrieving the page titles from the full dump is a lot more work than the sorting would be, and is more error prone.
It would save a bit of work on the servers that do all the sorting for every wiki each time a new dump is made.
Version: unspecified
Severity: enhancement